A high strain test device for building foundation piles

Abstract

The present invention provides a high-strain test device for building foundation piles, which belongs to the technical field of foundation pile detection, and includes a guide frame and a weight, wherein the guide frame forms a slideway for the weight to fall vertically. It also includes a positioning ring, a fixing member, a support block and a release assembly. Among them, the positioning ring is sleeved on the outer peripheral wall of the guide frame and can slide along the guide frame. The fixing member is arranged on the positioning ring and plugged with the guide frame to locate the sliding position of the positioning ring. The support block is horizontally slidably arranged on the positioning ring and extends into the slideway to abut against the bottom of the weight. The release assembly is rotatably arranged on the positioning ring and connected to the support block, and is used to push the support block to move and be pulled out from the bottom of the weight to make the weight fall. In the high-strain test device for building foundation piles provided by the present invention, the weight is supported by the support block in the guide frame, rather than relying on a crane to hang and wait for release. The crane is only responsible for lifting the weight to a suitable height and does not participate in bearing the impact force at the moment of release.

Description

Technical Field

[0001] The invention belongs to the technical field of pile foundation detection, and more specifically, relates to a high-strain test device for building pile foundations. Background Art

[0002] With the development of my country's economic construction, a large number of high-rise buildings and industrial plants have adopted building foundation piles. Whether they are prefabricated piles or cast-in-place piles, the quality of the piles is difficult to guarantee due to the complexity of geological conditions and construction technology, thus putting forward higher requirements for pile foundation detection technology. Among them, the high strain detection method is a commonly used building foundation pile detection method.

[0003] The basic principle of high strain detection is: use a heavy hammer to impact the pile top to produce sufficient relative displacement between the pile and the soil to fully stimulate the soil resistance around the pile and the pile end bearing force, and receive the stress wave signal of the pile through the force and acceleration sensors installed on both sides of the pile body below the pile top. Apply stress wave theory to analyze and process the time history curve of force and velocity, so as to determine the bearing capacity of the pile and evaluate the quality integrity of the pile body. This detection method requires a certain impact force to be applied to the pile top along the pile body. At present, it is usually carried out by using a heavy hammer plus a guide frame. The heavy hammer is lifted to a certain height by a crane, and the heavy hammer is released instantly by unhooking. The heavy hammer falls along the guide frame to hit the test pile body.

[0004] However, at the moment when the crane releases the heavy hammer, the heavy hammer will exert a strong reverse impact force on the crane, making it impossible for the crane to maintain a stable state when bearing the reverse impact force, thus posing certain safety hazards. Summary of the invention

[0005] The invention aims to provide a high-strain test device for building foundation piles, aiming to stably release a heavy hammer.

[0006] To achieve the above object, the technical solution adopted by the present invention is: to provide a high strain test device for building foundation piles, comprising a guide frame and a weight, wherein the guide frame forms a slideway for the weight to fall vertically, and further comprising:

[0007] A positioning ring, which is sleeved on the outer peripheral wall of the guide frame and can slide along the guide frame;

[0008] A fixing member, which is arranged on the positioning ring and plugged into the guide frame, and is used to locate the sliding position of the positioning ring;

[0009] A support block is horizontally slidably disposed on the positioning ring and extends into the slideway to abut against the bottom of the weight; and

[0010] The release assembly is rotatably arranged on the positioning ring and connected to the support block, and is used for pushing the support block to move and being drawn out from under the heavy hammer to make the heavy hammer fall.

[0011] In a possible implementation, the release component includes:

[0012] A driving ring is rotatably sleeved on the positioning ring and abuts against the supporting block;

[0013] When the driving ring rotates, the supporting block can be pushed to move along the radial direction of the positioning ring.

[0014] In a possible implementation, a guide groove is provided on the driving ring, the track of the guide groove is arc-shaped and extends from the outer circumference to the inner circumference of the driving ring, and the support block has a linkage portion, and the linkage portion is inserted into the guide groove;

[0015] When the driving ring rotates, the linkage portion moves along the guide groove to push the supporting block to move.

[0016] In a possible implementation, the release component further includes:

[0017] A gear ring, fixedly sleeved on the outer peripheral wall of the driving ring;

[0018] A driving motor, fixedly arranged on the positioning ring;

[0019] The gear is fixedly arranged at the output end of the driving motor and meshes with the gear ring.

[0020] In a possible implementation, the sliding sleeve on the positioning ring is provided with a limiting ring;

[0021] When the support block is pulled out from the slideway, the limiting ring can move to the outer peripheral wall to abut against the support block, so as to limit the support block from moving into the slideway.

[0022] In a possible implementation, a limiting groove is provided on the positioning ring along the axial direction, and a limiting block suitable for being slidably connected to the limiting groove is fixedly provided on the inner circumferential wall of the limiting circular ring.

[0023] In a possible implementation, the fixing member is rotatably sleeved on the positioning ring and has a pushing portion for pushing the limiting ring to move, and the limiting ring has elastic freedom to move toward the fixing member so that the pushing portion always abuts against the upper surface of the limiting ring;

[0024] When the fixing member is rotated to be plugged into the guide frame, the pushing portion pushes the limiting ring to move to avoid the support block, so that the support block can move freely;

[0025] When the fixing member rotates to avoid the guide frame, the pushing portion pushes the limiting ring to move to abut against the support block to limit the movement of the support block.

[0026] In a possible implementation, the pushing portion adopts a hemispherical structure and is fixedly arranged on the fixing member, and a ball groove suitable for the pushing portion to be embedded is opened on the upper surface of the limiting ring;

[0027] When the pushing portion is embedded in the ball groove, the limiting ring avoids the supporting block;

[0028] When the pushing portion moves out of the ball groove and abuts against the upper surface of the limiting ring, the limiting ring can abut against the supporting block.

[0029] In a possible implementation manner, a spring is fixedly disposed between the positioning ring and the limiting circular ring, and the spring is used to push the limiting circular ring to move toward the fixing member.

[0030] In a possible implementation, the fixing member has an inserting portion, and the guide frame is provided with a plurality of slots evenly distributed along a height direction, and the inserting portion is suitable for inserting into any of the slots.

[0031] Compared with the prior art, the high-strain test device for building foundation piles provided by the present invention has the following beneficial effects: through the design of the positioning ring, support block and release assembly, the weight is supported by the support block in the guide frame, rather than relying on a crane to hang and wait for release. In the preparation stage, the weight is firmly supported by the support block, and the crane is only responsible for lifting the weight to a suitable height and does not participate in bearing the impact force at the moment of release. When conducting the test, the release assembly can control the support block to be pulled out from under the weight, allowing the weight to fall smoothly, greatly reducing the risk of safety accidents caused by the instability of the crane due to the impact force, and ensuring the safety of on-site personnel and equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 A schematic diagram of the overall structure of a high-strain testing device for building foundation piles provided in an embodiment of the present invention.

[0034] Figure 2 A cross-sectional view of a positioning ring provided in an embodiment of the present invention.

[0035] Figure 3 A schematic diagram of the structure between a positioning ring and a driving ring provided in an embodiment of the present invention.

[0036] Figure 4 A schematic diagram of the structure between a positioning ring, a driving ring and a limiting ring provided in an embodiment of the present invention.

[0037] In the figure: 1, guide frame; 11, slot; 2, weight; 3, positioning ring; 31, support block; 311, linkage part; 32, limit groove; 4, fixing piece; 41, push part; 42, plug-in part; 51, driving ring; 511, guide groove; 52, gear ring; 53, driving motor; 54, gear; 6, limit ring; 61, limit block; 62, ball groove; 63, spring. DETAILED DESCRIPTION

[0038] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0039] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, and the spatially relative descriptions used here are interpreted accordingly.

[0040] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, and "several" means one or more, unless otherwise clearly and specifically defined.

[0041] See also Figure 1, a high-strain test device for building foundation piles provided by the present invention is now described. A high-strain test device for building foundation piles, comprising a guide frame 1 and a weight 2, wherein the guide frame 1 forms a slideway for the vertical drop of the weight 2. The slideway formed by the guide frame 1 guides the falling trajectory of the weight 2, so that the weight 2 is always in the center of the slideway during the falling process, which helps the weight 2 to fall along the vertical trajectory and hit the top of the pile, so that a uniform and stable relative displacement is generated between the pile and the soil, so that the force and acceleration sensors can collect stress wave signals that are more consistent with the theoretical model, reduce the detection error caused by the falling deviation of the weight 2, and improve the accuracy of the pile bearing capacity determination and pile body quality integrity evaluation.

[0042] See also Figure 1 and Figure 2 The high strain test device for building foundation piles also includes a positioning ring 3, a fixing member 4, a support block 31 and a release assembly. Among them, the positioning ring 3 is sleeved on the outer peripheral wall of the guide frame 1 and can slide along the guide frame 1. The fixing member 4 is arranged on the positioning ring 3 and plugged with the guide frame 1 to locate the sliding position of the positioning ring 3. The support block 31 is arranged on the positioning ring 3 to slide horizontally along the radial direction of the positioning ring 3, and extends into the slideway to abut against the bottom of the heavy hammer 2. The release assembly is rotatably arranged on the positioning ring 3 and is connected to the support block 31, which is used to push the support block 31 to move and be pulled out from under the heavy hammer 2 to make the heavy hammer 2 fall.

[0043] By adjusting the height of the positioning ring 3 on the guide frame 1, the falling height of the weight 2 can be adjusted, thereby improving the practicality of the device when in use, and can be applied to the detection of a variety of different pile foundations. In the preparation stage, the crane is only responsible for hanging the weight 2 into the guide frame 1. The weight 2 is supported in the guide frame 1 by the support block 31, rather than relying on the crane to hang and wait for release, so that the crane does not participate in the impact force at the moment of release, avoiding safety accidents caused by the instability of the crane due to the impact force, and ensuring the safety of on-site personnel and equipment. When releasing the weight 2, the support block 31 is controlled to be pulled out from under the weight 2 by the release component, so that the weight 2 can fall along the guide frame 1.

[0044] In some embodiments, see Figure 2 and Figure 3 The release assembly includes a driving ring 51. The driving ring 51 is rotatably sleeved on the positioning ring 3 and abuts against the support block 31. When the driving ring 51 rotates, it can push the support block 31 to move along the radial direction of the positioning ring 3.

[0045] The method of controlling the movement of the support block 31 by rotating the driving ring 51 is simpler and more intuitive to operate than complex mechanical unhooking or other release mechanisms. Workers only need to control the rotation direction and angle of the driving ring 51, without the need for cumbersome hooking and unhooking operations or coordinated operations of multiple parts, which simplifies the operation process and reduces the skill requirements for workers.

[0046] In some embodiments, see Figure 2 and Figure 3 The driving ring 51 is provided with a guide groove 511. The track of the guide groove 511 is an arc shape and extends from the outer circumference to the inner circumference of the driving ring 51. The center of the arc does not coincide with the center of the driving ring 51. The driving ring 51 is arranged above the support block 31. The support block 31 has a linkage part 311. The linkage part 311 extends upward and is inserted into the guide groove 511. When the driving ring 51 rotates, the linkage part 311 moves along the guide groove 511, so that the linkage part 311 pushes the support block 31 to move.

[0047] Specifically, when the driving ring 51 rotates, the linkage part 311 can move along the guide groove 511 under the pushing action of the driving ring 51, and drive the support block 31 to move. When the linkage part 311 moves to the end of the guide groove 511 close to the center of the driving ring 51, the support block 31 extends out from the positioning ring 3, so that it can be supported under the weight 2. When the linkage part 311 moves to the end of the guide groove 511 away from the center of the driving ring 51, the support block 31 is retracted into the positioning ring 3, so that it can be withdrawn from under the weight 2.

[0048] In some embodiments, see Figure 2 and Figure 3 The release assembly further includes a gear ring 52, a drive motor 53 and a gear 54. The gear ring 52 is fixedly sleeved on the outer peripheral wall of the drive ring 51. The drive motor 53 is fixedly arranged on the positioning ring 3. The gear 54 is fixedly arranged at the output end of the drive motor 53 and meshes with the gear ring 52.

[0049] The gear ring 52 is fixedly sleeved on the outer peripheral wall of the driving ring 51, and the driving motor 53 drives the driving ring 51 to rotate by meshing the gear 54 with the gear ring 52. This electric drive method can provide stable and precisely controllable power output. During the pile detection process, the driving motor 53 can control the speed and number of rotations of the gear 54 according to the preset program or the instructions of the staff, so as to achieve precise rotation of the driving ring 51, and then control the movement of the support block 31 and the release of the heavy hammer 2.

[0050] In addition, due to the use of the drive motor 53, the staff can control the operation of the drive motor 53 through a remote controller, a computer control terminal and other equipment at a safe location away from the test site. This not only improves the safety of the staff, but also facilitates the coordinated operation and centralized management of multiple groups of test devices at a complex construction site.

[0051] In some embodiments, see Figure 2 and Figure 4 A limiting ring 6 is provided on the positioning ring 3, and the limiting ring 6 is located above the driving ring 51. When the support block 31 is pulled out from the slideway, the limiting ring 6 can move to the outer peripheral wall against the support block 31 to limit the support block 31 from moving into the slideway.

[0052] When the position of the positioning ring 3 on the guide frame 1 needs to be adjusted, the support block 31 needs to be kept in the state of being retracted into the positioning ring 3 to avoid collision between the support block 31 and the guide frame 1 when the positioning ring 3 moves. The position of the support block 31 can be constrained by the limiting ring 6 to prevent the support block 31 from extending from the positioning ring 3.

[0053] Specifically, when the linkage part 311 moves to one end of the guide groove 511 away from the center of the driving ring 51, the limiting ring 6 can move down to abut against the upper surface of the driving ring 51, and the outer peripheral wall of the limiting ring 6 can abut against the linkage part 311, so that the support block 31 remains in the position retracted into the positioning ring 3.

[0054] In some embodiments, see Figure 2 and Figure 3 A limiting groove 32 is provided on the positioning ring 3 along the axial direction, and a limiting block 61 suitable for sliding connection with the limiting groove 32 is fixedly provided on the inner circumferential wall of the limiting circular ring 6.

[0055] The limiting groove 32 on the positioning ring 3 is slidably connected with the limiting block 61 on the inner wall of the limiting ring 6, and can play a limiting role in the movement of the limiting ring 6. When the limiting ring 6 needs to move to limit or avoid the support block 31, the limiting block 61 moves along the limiting groove 32 to ensure that the moving direction and displacement of the limiting ring 6 are within a predetermined range. At the same time, the limiting groove 32 not only plays a limiting role, but also provides a stable guide for the movement of the limiting ring 6. During the movement of the limiting ring 6, the limiting block 61 slides in the limiting groove 32, so that the limiting ring 6 will not have unstable phenomena such as offset and shaking, which helps to improve the contact reliability between the limiting ring 6 and the support block 31, and ensure that when the movement of the support block 31 needs to be limited, the limiting ring 6 can accurately contact the support block 31 and play a limiting role.

[0056] In some embodiments, see Figure 2The fixing member 4 is rotatably sleeved on the positioning ring 3 and has a pushing portion 41 for pushing the limiting ring 6 to move. The fixing member 4 is located above the limiting ring 6. The limiting ring 6 has elastic freedom to move toward the fixing member 4, so that the pushing portion 41 always abuts against the upper surface of the limiting ring 6.

[0057] When the fixing member 4 rotates to be plugged with the guide frame 1, the pushing portion 41 pushes the limiting ring 6 to move to avoid the support block 31, so that the support block 31 can move freely. When the fixing member 4 rotates to avoid the guide frame 1, the pushing portion 41 pushes the limiting ring 6 to move to abut the support block 31 to limit the movement of the support block 31.

[0058] Specifically, when the fixing member 4 is rotated to be plugged with the guide frame 1, the push portion 41 can push the limiting ring 6 to move to the avoidance linkage portion 311, so that the support block 31 can move freely. When the linkage portion 311 moves to the end of the guide groove 511 away from the center of the driving ring 51, that is, when the support block 31 is in a position to be retracted into the positioning ring 3, the fixing member 4 is rotated to avoid the guide frame 1, and the push portion 41 pushes the limiting ring 6 to move to abut the linkage portion 311, thereby limiting the movement of the support block 31 and preventing the support block 31 from extending out of the positioning ring 3.

[0059] In some embodiments, see Figure 2 and Figure 4 The push portion 41 has a hemispherical structure and is fixedly disposed on the fixing member 4 . The upper surface of the limiting ring 6 is provided with a ball groove 62 suitable for the push portion 41 to be embedded.

[0060] When the pushing portion 41 is embedded in the ball groove 62 , the limiting ring 6 avoids the support block 31 . When the pushing portion 41 is moved out of the ball groove 62 and abuts against the upper surface of the limiting ring 6 , the limiting ring 6 can abut against the support block 31 .

[0061] Specifically, when the push portion 41 is embedded in the ball groove 62, the limit ring 6 moves up, so that the limit ring 6 can fit the lower surface of the fixing member 4. When the fixing member 4 rotates, the push portion 41 can push the limit ring 6 downward during the process of moving out of the ball groove 62, so that the limit ring 6 moves downward.

[0062] The push portion 41 adopts a hemispherical structure and cooperates with the ball groove 62 on the limiting ring 6, so that the push portion 41 can achieve smoother contact when moving in and out of the ball groove 62, reducing jamming.

[0063] In some embodiments, see Figure 2 A spring 63 is fixedly arranged between the positioning ring 3 and the limiting ring 6 . The spring 63 is used to push the limiting ring 6 to move toward the fixing member 4 . The spring 63 is located in the limiting groove 32 .

[0064] The elastic force provided by the spring 63 can ensure that the limiting ring 6 always abuts against the pushing portion 41 on the fixing member 4, thereby ensuring that the fixing member 4 can adjust the position of the limiting ring 6 when rotating.

[0065] In some embodiments, see Figure 1 The inner circumference of the fixing member 4 has an inserting portion 42 , and the guide frame 1 has a plurality of slots 11 evenly distributed along the height direction, and the inserting portion 42 is suitable for being inserted into any slot 11 .

[0066] The plug-in portion 42 of the fixing member 4 is adapted to the multiple slots 11 on the guide frame 1, and the height position of the positioning ring 3 on the guide frame 1 can be adjusted according to the test requirements. By inserting the plug-in portion 42 into the slots 11 of different heights, the height of the positioning ring 3 can be easily changed, thereby realizing flexible adjustment of the falling position of the weight 2, meeting the diverse test requirements, and improving the versatility and adaptability of the test device.

[0067] In summary, the high-strain test device for building foundation piles provided by the present invention is different from the prior art in that, through the design of the positioning ring 3, the support block 31 and the release assembly, the weight 2 is supported by the support block 31 in the guide frame 1, rather than relying on the crane to suspend and wait for release. In the preparation stage, the weight 2 is firmly supported by the support block 31, and the crane is only responsible for lifting the weight 2 to a suitable height and does not participate in bearing the impact force at the moment of release. When conducting the test, the release assembly can control the support block 31 to be pulled out from under the weight 2, so that the weight 2 falls smoothly, which greatly reduces the risk of safety accidents caused by the instability of the crane due to the impact force, and ensures the safety of on-site personnel and equipment.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0069] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0070] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

Claims

1. A high-strain test device for building foundation piles, comprising a guide frame (1) and a weight (2), wherein the guide frame (1) forms a slideway for the weight (2) to fall vertically, and is characterized in that: Also includes: A positioning ring (3) is sleeved on the outer peripheral wall of the guide frame (1) and can slide along the guide frame (1); A fixing member (4) is arranged on the positioning ring (3) and plugged into the guide frame (1) to locate the sliding position of the positioning ring (3); A support block (31) is horizontally slidably disposed on the positioning ring (3) and extends into the slideway to abut against the bottom of the weight (2); as well as A release assembly is rotatably disposed on the positioning ring (3) and connected to the support block (31), and is used to push the support block (31) to move and be drawn out from below the heavy hammer (2) to cause the heavy hammer (2) to fall; The upper sliding sleeve of the positioning ring (3) is provided with a limiting ring (6); When the support block (31) is pulled out of the slideway, the limiting ring (6) can move to the outer peripheral wall to abut against the support block (31) to limit the movement of the support block (31) into the slideway; The fixing member (4) is rotatably sleeved on the positioning ring (3) and has a pushing portion (41) for pushing the limiting ring (6) to move, and the limiting ring (6) has an elastic degree of freedom to move toward the fixing member (4), so that the pushing portion (41) always abuts against the upper surface of the limiting ring (6); When the fixing member (4) is rotated to be plugged into the guide frame (1), the pushing portion (41) pushes the limiting ring (6) to move to avoid the support block (31), so that the support block (31) can move freely; When the fixing member (4) rotates to avoid the guide frame (1), the pushing portion (41) pushes the limiting ring (6) to move to abut against the support block (31) to limit the movement of the support block (31).

2. A high strain test device for building foundation piles as claimed in claim 1, characterized in that: The release assembly comprises: A driving ring (51) is rotatably sleeved on the positioning ring (3) and abuts against the supporting block (31); When the driving ring (51) rotates, it can push the supporting block (31) to move along the radial direction of the positioning ring (3).

3. A high strain test device for building foundation piles as claimed in claim 2, characterized in that: The driving ring (51) is provided with a guide groove (511), the trajectory of the guide groove (511) is arc-shaped and extends from the outer circumference to the inner circumference of the driving ring (51), and the support block (31) has a linkage portion (311), and the linkage portion (311) is inserted into the guide groove (511); When the driving ring (51) rotates, the linkage portion (311) moves along the guide groove (511) to push the support block (31) to move.

4. A high strain test device for building foundation piles as claimed in claim 2, characterized in that: The release assembly also includes: A gear ring (52) fixedly sleeved on the outer peripheral wall of the driving ring (51); A driving motor (53) fixedly disposed on the positioning ring (3); A gear (54) is fixedly arranged at the output end of the drive motor (53) and meshes with the ring gear (52).

5. A high strain test device for building foundation piles as claimed in claim 1, characterized in that: The positioning ring (3) is provided with a limiting groove (32) along the axial direction, and a limiting block (61) suitable for being slidably connected to the limiting groove (32) is fixedly arranged on the inner peripheral wall of the limiting circular ring (6).

6. A high strain test device for building foundation piles as claimed in claim 1, characterized in that: The pushing portion (41) has a hemispherical structure and is fixedly arranged on the fixing member (4); the upper surface of the limiting ring (6) is provided with a ball groove (62) suitable for the pushing portion (41) to be embedded; When the pushing portion (41) is embedded in the ball groove (62), the limiting ring (6) avoids the supporting block (31); When the pushing portion (41) moves out of the ball groove (62) and abuts against the upper surface of the limiting circular ring (6), the limiting circular ring (6) can abut against the supporting block (31).

7. A high strain test device for building foundation piles as claimed in claim 1, characterized in that: A spring (63) is fixedly arranged between the positioning ring (3) and the limiting circular ring (6), and the spring (63) is used to push the limiting circular ring (6) to move towards the fixing member (4).

8. A high strain test device for building foundation piles as claimed in claim 1, characterized in that: The fixing member (4) has a plug-in portion (42), and the guide frame (1) has a plurality of slots (11) evenly distributed along the height direction, and the plug-in portion (42) is suitable for plugging into any of the slots (11).

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